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Fabrication and Enhanced Dielectric Properties of Polyimide Matrix Composites with Core–shell Structured CaCu 3 Ti 4 O 12 @tio 2 Nanofibers

Journal of Materials Science: Materials in Electronics(2018)

School of Chemistry and Chemical Engineering

Cited 32|Views9
Abstract
Core–shell structured CaCu3Ti4O12@TiO2 (CCTO@TiO2) nanofibers were prepared via a normal coaxial electrospinning technique with sol precursors. Polyimide (PI) nanocomposite films containing the core–shell structured CCTO@TiO2 nanofibers were fabricated by the solution casting method. The core–shell structure of the CCTO@TiO2 nanofibers was confirmed through transmission electron microscope. The percolation of the CCTO/TiO2 interfaces leads to much enhanced interfacial polarization of the CCTO@TiO2 nanofibers, which gives rise to substantially increased dielectric constant of the nanocomposites. Compared to the nanocomposites with CCTO nanofibers, the breakdown strength of the nanocomposites with CCTO@TiO2 nanofibers is also increased due to the charge shifting is limited to the interfacial zone of CCTO/TiO2 interfaces, instead of in the PI matrix to form a percolation path. For the nanocomposites with 5 vol% nanofibers, the dielectric constant of 5.55 was enhanced to 5.85 and the breakdown strength of 201 kV/mm was increased to 236 kV/mm by utilizing the TiO2 coated CCTO nanofibers, while the dielectric loss shows no obvious change. Meanwhile, the PI nanocomposite film filled with 1 vol% CCTO@TiO2 nanofibers exhibits a maximal energy density of 1.6 J/cm3. The core–shell structured nanofibers open up an effective way to optimize the dielectric properties of polymer nanocomposites with high energy density.
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要点】:论文研究了通过制备核心-壳结构的CaCu3Ti4O12@TiO2纳米纤维来增强聚酰亚胺基复合材料的介电性能,实现了高能量密度的优化。

方法】:采用同轴电纺技术结合溶胶前驱体,制备核心-壳结构的CCTO@TiO2纳米纤维,并通过溶液浇铸法制备聚酰亚胺纳米复合膜。

实验】:利用透射电子显微镜确认了CCTO@TiO2纳米纤维的核心-壳结构,实验结果表明,使用5 vol%的CCTO@TiO2纳米纤维的复合材料,介电常数从5.55提升到5.85,击穿强度从201 kV/mm增加到236 kV/mm,介电损耗无明显变化;填充1 vol% CCTO@TiO2纳米纤维的聚酰亚胺复合膜展现出最大能量密度为1.6 J/cm³。